[Q] Internal SD card

http://forum.xda-developers.com –
Any special/easy method on how to wipe the internal SD card. Just wanna start fresh... Currently S-OFF stock rooted latest AT&T firmware with twrp recovery
Sent from my HTC One using xda premium
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I have always used CWM Rom Manager but now it only bricks the phone when installed. "Encryption Error - Factory Reset", but that does not work, have to use AP Fastboot and reinstall JellyBean. Now that I have it up again, I want a recovery solution besides Titanium Backup that will backup the entire phone, like CWM did. So, I installed SafeStrap.

Hey guys,
I have a T999L running 4.3 stock, TWRP 2.7.0.0, rooted, de-knoxed. I performed a nandroid backup in TWRP, went back into TWRP to install a custom rom but now TWRP cannot mount my SD card nor my internal memory. I Odin'ed 4.3 stock back on the device, reinstalled TWRP, but still no dice - TWRP will not mount SD card/internal memory. I flashed CWM over TWRP but the issue persisted.